Asthma and influenza vaccination in elderly hospitalized patients: Matched case-control study in Spain

1. Suárez-Varela, M.M.
2. Llopis, A.
3. Fernandez-Fabrellas, E.
4. Sanz, F.
5. Perez-Lozano, M.J.
6. Martin, V.
7. Astray, J.
8. Castilla, J.
9. Egurrola, M.
10. Force, L.
11. Toledo, D.
12. Domínguez, À.